On 2018-Jul-16, David Rowley wrote:
> On 16 July 2018 at 12:55, David Rowley <david.rowley@2ndquadrant.com> wrote:
> > Thinking about this some more, I don't quite see any reason that the
> > partitioned_rels for a single hierarchy couldn't just be a Bitmapset
> > instead of an IntList.
>
> Of course, this is not possible since we can't pass a List of
> Bitmapsets to the executor due to Bitmapset not being a node type.
Maybe we can just add a new node type that wraps a lone bitmapset. The
naive implementation (just print out individual members) should be
pretty straightforward; a more sophisticated one (print out the "words")
may end up more compact or not depending on density, but much harder for
debugging, and probably means a catversion bump when BITS_PER_BITMAPWORD
is changed, so probably not a great idea anyway.
I suppose the only reason we haven't done this yet is nobody has needed
it. Sounds like its time has come.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
